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The GlueX Detector in Hall-D at Jefferson Lab

The GlueX Detector in Hall-D at Jefferson Lab. February 16, 2010 David Lawrence, Jefferson Lab (for Curtis A. Meyer , Carnegie Mellon University). Newport News, Virginia. Exotic Hybrid Mesons and the choice of photoproduction. spins not aligned (S=0).

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The GlueX Detector in Hall-D at Jefferson Lab

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  1. The GlueX Detector in Hall-Dat Jefferson Lab February 16, 2010 David Lawrence, Jefferson Lab (for CurtisA. Meyer, Carnegie Mellon University) Newport News, Virginia GlueX - ACTS 2009 - David Lawrence

  2. Exotic Hybrid Mesonsand the choice of photoproduction spins not aligned (S=0) Conventional meson has quantum numbers determined only by constituent quarks Hybrid meson has angular momentum contribution from “the glue” J. Dudek et al., PRD 79 (2009) Compute radiative decays in charmonium to normal and hybrid mesons. Rates are comparable. Work currently underway to compute the same for light quarks spins aligned (S=1) JPC = 0-+, 0++, 1++ 1+-, 2-+, 2++ JPC = 0-+, 0++, 0+- 1++, 1-+, 1+- 2-+, 2++, 2+- JPC = 0-+, 0++, 0+- 1++, 1-+, 1+- 2-+, 2++, 2+- JPC P = (-1)L+1 C = (-1)L+S Expect higher exotic hybrid production rate using photon beam “exotic” states GlueX - ACTS 2009 - David Lawrence

  3. QCD Potential The normal mesons are built up from a “quark-antiquark pair” with a “ground-state” flux tube. < S=0, L=0 > < S=1, L=0 > < S=0, L=1 > < S≠0, L≠1 > Gluonic Excitations provide an experimental measurement of the excited QCD potential GlueX - ACTS 2009 - David Lawrence July 7, 2009

  4. QCD Potential • Excited glue yields hybrid nonets • Many of the hybrid nonets have exotic quantum numbers • Lattice QCD predicts exotics ~2GeV/c2. • 3 nonets of exotic-quantum number states. • Decays expected to 4-5 pions with photons. • GlueX has been designed to detect these. • Large acceptance for these final states. • Good resolutions. • Partial Wave Analysis tools to carry out analysis.

  5. Upgrade magnets and power supplies CHL-2 The JLab 12GeV Upgrade 6 GeV CEBAF 12 GeV CEBAF 11 GeV CEBAF Two 1.1GV linacs Two 0.6 GV linacs Enhanced capabilities in existing Halls GlueX - ACTS 2009 - David Lawrence

  6. The GlueX Detector 2.2 Tesla Solenoid • 2.2T superconducting solenoidal magnet • Fixed target (LH2) • 108 tagged g/s (8.4-9.0GeV) • hermetic TOF time of flight SC start counter • Charged particle tracking • Central drift chamber (straw tube) • Forward drift chamber (cathode strip) • Calorimetry • Barrel Calorimeter (lead, fiber sandwich) • Forward Calorimeter (lead-glass blocks) • PID • Time of Flight wall (scintillators) • Start counter • Barrel Calorimeter GlueX - ACTS 2009 - David Lawrence

  7. Hall D: February 2010 Expect some occupancy late in 2010

  8. Detector Construction (2009/2010) • 48-module BCAL at University of Regina • Completing modules 3 and 4. • First shipments to JLab in April

  9. Detector Construction (2009/2010) • Lead-glass Forward Calorimeter at Indiana University • Contract for construction in place soon. • Work starting spring 2010 • Central Drift Chamber at Carnegie Mellon • Contract for construction in place soon. • Work starting spring 2010 More contracts starting in 2011 and 2010

  10. The GlueX Detector in Hall-D • The 12 GeV upgrade of Jefferson Lab is currently under construction • Construction of Hall-D broke ground in April 2009 • Construction of the GlueX detector has started Hall-D Groundbreaking Current plans call for the first beam in Hall-D/GlueX in late 2014

  11. Summary • The GlueX Detector and Hall-D at JLab are under construction. • We expect to start the search for exotic mesons in 2014. • There are other physics programs that are starting to materialize for GlueX • PrimEx (Primakoff Effect) on the eta approved in 2010. • A workshop on these activities in 2010.

  12. Backup Slides GlueX - ACTS 2009 - David Lawrence

  13. The GlueX Experiment detectable final state Goal: map the spectrum of exotic hybrid mesons Method: Photo-produce hybrids off proton target and identify the quantum states using Partial Wave Analysis of decay product distributions hybrid meson 9GeV linearly polarized (mixed charged and neutral) GlueX - ACTS 2009 - David Lawrence

  14. David Lawrence (JLab) • Electron beam accelerator • continuous-wave (1497MHz, 2ns bunch structure in halls) • Polarized electron beam • Upgrading to 12GeV(from 6GeV) • 70 mA max @ 12Gev (200mA max @ 6GeV) The GlueX Detector Future Hall-D site Existing experimental halls A, B, C GlueX - ACTS 2009 - David Lawrence

  15. Hall-D Complex at Jefferson Lab electron beam ~100 meters Construction has recently begun and will be completed Fall 2011. (Buildings only, detectors will follow) GlueX - ACTS 2009 - David Lawrence

  16. Most electrons don’t interact with the diamond and get bent right into the beam dump The Photon Tagger e- photon Some electrons undergo bremstrahlung(“breaking radiation”) and create a photon while passing through the diamond 12m long vacuum chamber e- The photon carries some energy away leaving the electron with less so that it gets bent more by the magnetic field 1.5T dipole magnet These electrons pass through detectors lining the side of the vacuum chamber. Which detector gets hit tells us how much energy the electron was left with (and therefore how much was given up to the photon!) The experiment will ultimately see 100 million tagged photons every second impinging on our liquid Hydrogen target (only a tiny fraction will interact). e- 20mm diamond radiator GlueX - ACTS 2009 - David Lawrence

  17. Calorimetry • Barrel Calorimeter: • 191 layer Pb-scintillating fiber sandwich (15.5Xo) • 12.5% sampling fraction • 1152 + 192 = 1344 readout sections/end • sE/E= (5.54/√E 1.6) % • sz = 5mm/√E • st = 74ps/√E 33ps • angular coverage 11o < q < 120o • Forward Calorimeter: • 2800 F8-00 and F108 (center) Pb-glass blocks • 4cm x 4cm x 45cm • sE/E= (5.7/√E 2.0) % • sxy = 6.4mm/√E • angular coverage 2o < q < 11o GlueX - ACTS 2009 - David Lawrence

  18. Charged Particle Tracking Chambers • Central Drift Chamber: • 3522 straw tubes (1.6cm diameter) • 12 axial layers, 16 stereo layers (6o) • dE/dx for p < 450 MeV/c • sr = 150mm • angular coverage 6o<q<155o sp/p : 1.5 - 3.0% sq : 1 - 8 mrad sf : 2 – 3 mrad • Forward Drift Chamber: • 4 packages, 6 planes/package, 96 wires/plane (2304 sense wires) • cathode strip readout (48 planes x 216 strips/plane = 10,368 strips) • sr = ~200mm perpendicular to wire (drift time) • ss = ~200mm along wire (cathode strips) • angular coverage 1o<q<30o GlueX - ACTS 2009 - David Lawrence

  19. A single gppb1p event Final state: pp+ p+ p- p- po GlueX - ACTS 2009 - David Lawrence

  20. Particle ID Particle ID is done primarily through time of flight with some help from dE/dx in chambers. Space is left in design for a future PID detector. Beam Test Data Expected Separation ~200 ps Start Counter • 40 scintillators • 300 ps (w/tracking) • Used for start-up Barrel Calorimeter ~80 ps CDC dE/dx Forward TOF diff(ns) diff(ps) • pp separation <450MeV/c • pK separation <275MeV/c GlueX - ACTS 2009 - David Lawrence

  21. Locations of Primary Particle Interactions BCAL BCAL CDC FDC FDC FCAL FCAL CDC GlueX - ACTS 2009 - David Lawrence

  22. JANAMulti-threaded event processing framework Rate scalability Multi-threaded Modular GlueX - ACTS 2009 - David Lawrence

  23. Hall D: Detector Design Parameters Page 23 GlueX - ACTS 2009 - David Lawrence

  24. A 3-Track Event ~20 space points per track GlueX - ACTS 2009 - David Lawrence

  25. Inhomogeneous Magnetic Field Map (-symmetric) GlueX - ACTS 2009 - David Lawrence

  26. The GlueX Experiment F Future

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